Rust

Fix the `MDB_NOTLS` documentation #419

Job	Run time
Ensure clippy is happy on heed and heed3	20s
Check all the features of the heed3 project (ubuntu-latest)	17s
Check the heed3 project (ubuntu-latest)	18s
Check all the features of the heed project (ubuntu-latest)	15s
Check all the features of the heed3 project (macos-latest)	21s
Check all the features of the heed project (macos-latest)	20s
Check the heed3 project (windows-latest)	1m 59s
Run the heed examples (ubuntu-latest)	20s
Check the heed3 project (macos-latest)	21s
Ensure the heed and heed3 project are formatted	11s
Run the heed examples (macos-latest)	26s
Run the heed3 examples (ubuntu-latest)	22s
Run the heed3 examples (macos-latest)	31s
Test the heed3 project (ubuntu-latest)	41s
Ensure heed3 is not erasing heed	4s
Test the heed3 project (windows-latest)	2m 39s
Test the heed project (ubuntu-latest)	34s
Test the heed3 project (macos-latest)	38s
Test the heed project (windows-latest)	2m 57s
Test the heed project (macos-latest)	34s
	14m 8s

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